Start by slicing the flank steak thinly against the grain. This step is crucial for tenderness. Place the sliced beef in a bowl and toss it with cornstarch until evenly coated. The cornstarch helps seal in moisture and gives the sauce a velvety texture.
In a separate bowl, whisk together soy sauce, brown sugar, beef broth, and oyster sauce. Stir until the sugar dissolves completely. This sauce creates the perfect balance of salty, sweet, and savory flavors that define a great beef broccoli recipe.
Heat a tablespoon of oil in a large skillet over medium-high heat. Add the broccoli and cook for 3 to 4 minutes. You want it bright green and slightly crisp. Remove it from the pan and set it aside so it doesn’t overcook.
Add the remaining oil to the skillet. Spread the beef in a single layer and let it sear undisturbed. Cook for about 2 to 3 minutes per side. This quick, high-heat cooking keeps the beef tender and flavorful.
Once the beef is nearly cooked through, stir in the minced garlic and grated ginger. Cook for about 30 seconds until fragrant. Be careful not to burn them, as garlic can turn bitter quickly.
Return the broccoli to the pan. Pour in the prepared sauce and stir well. Let the mixture simmer for a few minutes until the sauce thickens and coats the beef and broccoli beautifully.
Drizzle sesame oil over the dish and give it one final stir. Remove from heat and serve immediately over warm white rice for the ultimate comfort meal.